I would think that motor would make a good 400 hp. I think you may have made a mistake about the cam duration numbers being at at .050. If that is the advertised nubmer, then it should work fine. I have a friend that has run a 150 shot on a stock bottom end for ever and he has never had any problems. Of coarse, he has never leaned it out though. Personally, I wouldent run more than a 100 shot on hyper pistons, but you probably would be able to run a 150 shot as long as you dont lean it out.